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Is there any Mach-Zehder interferometer that operates at RF frequencies, i.e., 2.5 or 5 GHz

Dimitrios Tzarouchis
Prodigy 20 points
Other Parts Discussed in Thread: ADC12DJ3200, TRF3705

Dear all

I am wondering the following: is there any equivalent of a photonic Mach-Zehder Interferometer (two inputs - two outputs) but at the RF domain, i.e., that operates at 2.5-5 GHZ??? I need a device that for a given input and voltage can give me a desired output in amplitude and phase. Is there any TI solution that can cover this functionality?

Thank you in advance for any of your responces.

  • 0
    TI__Mastermind 18065 points

    Dimitrios:

    You can check out the ADC12DJ3200 ADC.  This is a dual, 12-bit, 3.2 GSPS ADC with an input bandwidth of 8 GHz.  You can capture two channels in a synchronized fashion.  From there, with an FFT transformation you can get the amplitude and phase response over frequency.  You can then compare the relative amplitude and phase from each channels.

    Interesting application,

    --RJH

  • 0 in reply to RJ Hopper
    Prodigy 20 points

    RJH:

    Thank you for your response. Yes this device ADC12DJ3200 might do the work. However, what I am searching is for an structure that can take two input signals (with known amplitude and phase) and give me two output signals with desired phase and amplitude. And I need this functionality for many MZI since the purpose is to construct a network of these elements but with tunable characteristics. The solution you provide is

    1. Quite expensive pr unit

    2. It involves the RF-to-digital conversion, an undesired feature for my application.

    Therefore, is there any MZI analog TI device that can perform the requested functionality???

    Thank you for your time!

  • 0 in reply to Dimitrios Tzarouchis
    TI__Mastermind 18065 points

    Dimitrios:

    No, TI does not have an analog device that is exactly what you want. 

    If you are trying to simulate a case with two input signals transfer to an output where one coherently combines and one destructively interferes, then a quadrature modulator may suffice.  Check out the TRF3704 or the TRF3705 and the TSW38J84 reference design.  The modulator inputs two low frequency signals (say below 1 GHz) that are in quadrature and mixes it to a high frequency signal.  The LO signal provides the mixing frequency.  If the input tones and device were perfect and ideal, then the input signals would constructively add at the upper sideband signal (LO + Fbb) and would destructively interfere at the lower sideband (LO - Fbb).  Imperfections in the quadrature input signals will show some of the lower sideband signal.  If you adjust the phase and amplitude of the BB signals, you can control the amount of constructive and destructive interference.  A reference design like the TSW38J84 provides a DAC to generate the BB signals and the capabilities to digitally adjust the amplitude and phase of the BB signals.

    --RJH